[Merge] ~mwhudson/livecd-rootfs/+git/livecd-rootfs:lang-layer-names into livecd-rootfs:ubuntu/master

[Sebastien Bacher]

Review: Approve

Right, fair enough. Let's get that in, we will need to update the squashfs mount hack for the naming change but that's trivial to do and I will handle it once the package is uploaded to impish
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https://code.launchpad.net/~mwhudson/livecd-rootfs/+git/livecd-rootfs/+merge/406796
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